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Estimation of hydrogenerator rotor dynamic thermal margine
aUniversity of Belgrade, Faculty of Electrical Engineering + University of Belgrade, Electrical Engineering Institute 'Nikola Tesla'
bElektroprivreda Srbije, Ogranak HE Đerdap, Kladovo
cUniversity of Belgrade, Electrical Engineering Institute 'Nikola Tesla'
Keywords: hydrogenerator; thermal capacity; field winding thermal time constant; temperature of field winding
Field winding temperature of the synchronous generator is one of limiting factors shaping generator PQ capability curve. Therefore of great operational importance is to have information about this temperature estimated with the utmost accuracy. It can be measured directly using built-in temperature sensors or determined indirectly. With the increasing penetration of renewable energy sources into the high-voltage transmission system, the fundamental changes happen in the way conventional generating units work, including hydrogenerators. They are facing the new operating modes characterized by rapid load changes and an increased number of start-stop cycles. These modes of operation lead to additional thermal stress of the hydrogenerator parts, including the rotor. In order to be able to respond to new demands that they are faced with, it is necessary to estimate the actual thermal capacity of the rotor and its influence on the dynamic hydrogenerator PQ capability curve.
*** (2022) Optimizovano praćenje termičkog stanja rotora hidrogeneratora radi poboljšanja pouzdanosti i produženja operativnog životnog veka konvencionalnog hidrogeneratora u realnom vremenu. Beograd: Elektrotehnički institut Nikola Tesla ad, Elaborat broj 222052
*** (2017) Izveštaj o primopredajnim ispitivanjima revitalizovanog agregata A1 u HE 'Đerdap1' - merenje električnih veličina. Beograd: Elektrotehnički institut Nikola Tesla ad, sveska 1
*** (2022) Temperaturni monitoring rotora sinhronih generatora, statistička obrada i analiza temperaturnih režima rada i uticaj na pogonska ograničenja. Beograd: Elektrotehnički institut Nikola Tesla ad, Elaborat broj 221026
*** (2005) IEEE recommended practice for excitation system models for power system stability studies. IEEE Std 421.5-2005
Bayazitoglu, Y., Necati, O.M. (1988) Elements of heat transfer. McGraw-Hill Book Company


article language: Serbian
document type: Professional Paper
DOI: 10.5937/zeint32-41740
received: 14/12/2022
accepted: 26/12/2022
published in SCIndeks: 13/01/2023
peer review method: single-blind
Creative Commons License 4.0

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